Sadly, it didn't go so smoothly for me -- more like a rollercoaster that I'm still on. I think the initial High Sierra install was fine (at least it booted and I went through the setup), but then I immediately (and perhaps stupidly) went into the App Store and installed the supplemental update. Upon restart, I seemed to be in a crash/boot loop and spent a couple hours trying to figure that out. Then suddenly it booted fine and I thought I was an idiot because all those reboots were probably just part of the update process. But next time I restarted it went back to crashing and booting back to Clover. I haven't had a successful boot since then, even trying safe mode.
On top of that I had trouble making a new Unibeast USB drive (on a different mac) so I can boot that way. I'm trying that again now, so if it works I will go in and see if I can find/fix any problems. If not, I will probably just start from scratch. Not a big deal because the hackintosh is a secondary machine for me.